Soda/Pop Can MacGuyverizing..

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I was doing some research on DIY soda/pop can camping stoves.. and I came across some instructions on how to make a functional/loud survival soda/pop can whistle (found just before the 4:00 mark).. In a survival situation.. it could really come in handy.. And in a non-survival situation.. it’s just cool to be able to make a whistle a-la-MacGuyver..